package com.dragon.concurrent.demo.callable;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;

/**
 * @author dragon
 * @version V1.0.0-RELEASE
 * @date 2019/6/10 17:12
 */
public class CallableDemo {

    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>(16);
        Set<String> strings = map.keySet();
    }
}
